JP2020079211A - Cosmetics and manufacturing method thereof - Google Patents

Abstract

To provide powder cosmetics having an unevenness correction effect or a color unevenness correction effect that are superior to the conventional technologies.SOLUTION: Provided is a cosmetic material containing an inorganic particle group consisting of first inorganic particles and second inorganic particles in an amount of 65 mass% or more. The first inorganic particles are at least one selected from mica, talc, sericite, smectite, and synthetic mica. The second inorganic particles are at least one selected from zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide, and ultramarine. Also, in the number-based particle size distribution of the inorganic particle group, the particle size has a peak of maximum intensity in the range of 2 μm or more and 6 μm or less, and the number of particles of less than 1 μm is 5 number-percent or more and 15 number-percent or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cosmetic and a method for producing the same. It is a cosmetic particularly useful as a powder cosmetic.

  Conventionally, the effect of correcting irregularities and the effect of correcting color unevenness using cosmetics such as powder cosmetics (powder foundation) have been known.

  The unevenness correction effect is an effect of correcting minute unevenness of skin such as pores, fine wrinkles, and roughness of texture to be inconspicuous to give a texture or impression such as brightness, transparency, and luster. The color unevenness correction effect is an effect of correcting the minute shades of skin color such as spots and freckles to be inconspicuous to give a texture and impression such as brightness, transparency and luster. As a method of correcting minute unevenness of the skin and a method of correcting minute unevenness of color of the skin, the boundary between the concave portion and the convex portion is controlled by controlling the light scattering property using the refractive index and shape of the powder. A method of blurring is known. For example, in Patent Document 1, a titanium oxide-coated plate-like powder having no glitter, a plate-like powder having a refractive index of 1.5 or more and less than 2.2, and a spherical particle having a refractive index of 1.3 or more and less than 1.5 A powder cosmetic containing a powder for irregularity correction is disclosed. Further, Patent Document 2 discloses a powder cosmetic containing a red pigment, titanium oxide, and an extender pigment and having an effect of correcting color unevenness.

JP, 2003-277127, A JP, 2015-199727, A

  However, with the improvement in the performance of imaging devices such as cameras and the higher image quality of televisions, the unevenness correction effect and the color unevenness correction effect required for cosmetics have become more sophisticated year by year, and that trend will continue. It is expected that. Therefore, in the powder cosmetics disclosed in the prior art 1, the unevenness correction effect was not sufficient. Further, in the powder cosmetics disclosed in the related art 2, the color unevenness coverage rate, which is an index of the color unevenness correction effect, is not sufficient at about 60%.

  The cosmetic having an unevenness correcting effect for solving the above problem is a cosmetic containing an inorganic particle group consisting of first inorganic particles and second inorganic particles in an amount of 65% by mass or more, wherein the first inorganic particles are At least one selected from mica, talc, sericite, smetite, and synthetic mica, wherein the second inorganic particles are zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide, and ultramarine blue. It is at least one selected, and in the number-based particle size distribution of the inorganic particle group, the maximum intensity peak is in the range of particle size of 2 μm or more and 6 μm or less, and particles of less than 1 μm are 5% to 15% in number. % Or less.

  A cosmetic having an effect of correcting color unevenness for solving the above problem is a cosmetic containing 65% by mass or more of an inorganic particle group consisting of first inorganic particles and second inorganic particles, wherein the first inorganic particles are Is at least one selected from mica, talc, sericite, smetite and synthetic mica, and the second inorganic particles are zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide and ultramarine blue. In the particle size distribution based on the number of the inorganic particles, the maximum intensity peak is in the range of 3 μm or more and 8 μm or less, and the number of particles of less than 1 μm is 6% by number or more and 20% or more. It is characterized in that the number is less than or equal to %.

  According to the present invention, it is possible to provide a cosmetic having an unevenness correction effect or a color unevenness correction effect, which is superior to the prior art.

(A) It is a figure which shows the relationship between the Example of cosmetics (1st Embodiment) provided with the unevenness correction effect of this invention, and the peak particle diameter and the number of particles less than 1 micrometer in the cosmetics of a comparative example. (B) It is a figure which shows the relationship between the example of the cosmetics (2nd Embodiment) provided with the color unevenness correction effect of this invention, and the peak particle diameter and the number of particles of less than 1 micrometer in the cosmetics of a comparative example. (A) It is explanatory drawing of the unevenness correction effect of the cosmetics of this invention. (B) In the number-based particle size distribution of the inorganic particle group, it is an explanatory diagram when the peak showing the maximum strength of the particle size is too small. (C) It is an explanatory view when the peak showing the maximum intensity of the particle size is too large in the number-based particle size distribution of the inorganic particle group.

  Hereinafter, embodiments of the present invention will be described in detail.

[First Embodiment]
The cosmetic of the first embodiment is a powder cosmetic having an unevenness correction effect.

  The cosmetic of the present invention contains the first inorganic particles (A) and the second inorganic particles (B). The first inorganic particles (A) are extender pigments selected from at least one of mica, talc, sericite, smetite, and synthetic mica. The second inorganic particles (B) is a coloring pigment selected from at least one of zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide and ultramarine blue. In addition, the cosmetic of the present invention may contain a property adjusting component (C) and a binder/liquid component (D) as components other than the first inorganic particles (A) and the second inorganic particles (B). ..

<First inorganic particles (A)>
The extender pigment, which is the first inorganic particle, is a plate-like or scale-like powder and has an effect of imparting a feeling of adhesion of the cosmetic to the skin and a feeling such as elongation. Specific examples thereof include mica, talc, sericite, smetite, and synthetic mica, and one or more of these can be used. In addition to these, synthetic phlogopite or silicic anhydride may be contained. Further, from the viewpoint of controlling the dispersion characteristics, the first inorganic particles may be subjected to surface treatment by a known method such as fluorine treatment, silicone treatment, and surfactant.

  The starting material for the first inorganic particles is not particularly limited, but has a preferable particle size. Specifically, the number average average equivalent circle diameter is preferably in the range of 2 μm to 100 μm. When the particle diameter of the first inorganic particles is within this range, the powder cosmetic after crushing can easily have sufficient adhesion to the skin, and can easily obtain a desired particle size distribution described later. On the other hand, if the particle size is smaller than 2 μm, the adhesion of the crushed cosmetic powder to the skin may decrease. Further, the first inorganic particles may aggregate with each other, and the feeling of elongation or the like may not be good. On the other hand, if the particle diameter is larger than 100 μm, the particle size distribution of the pulverized powder cosmetic material tends to be broad, and it may be difficult to obtain desired optical characteristics. The range is more preferably 8 μm or more and 20 μm or less.

  Further, when the first inorganic particles are plate-like powder, the aspect ratio thereof is preferably 5 or more. This is because if the aspect ratio is 5 or more, the second inorganic particles can easily cover the first inorganic particles.

  The particle size is the particle size showing the maximum strength in the number-based particle size distribution. A method for measuring the particle size of the first inorganic particles is, for example, an image imaging method. Examples of the apparatus that can be used include Morphology G3 (Malvern PANalytical). At a specific observation magnification, for example, 20,000 particle images can be obtained, and the average equivalent circle diameter can be calculated from the area (the same applies to the second inorganic particles described later).

<Second inorganic particles (B)>
The color pigment, which is the second inorganic particles, has an effect of providing hiding power and coloring power required for cosmetics. Specific examples thereof include zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide, and ultramarine, and one or more of these can be used. In addition to these, metal complexes, inorganic pigments such as carbon black, synthetic organic pigments, and natural organic dyes may be contained. Also, from the viewpoint of controlling the dispersion characteristics, the second inorganic particles may be subjected to surface treatment by a known method such as fluorine treatment, silicone treatment, and surfactant.

  The starting material for the second inorganic particles is not particularly limited, but has a preferable average particle size. Specifically, the number average average circle equivalent diameter is preferably in the range of 0.1 μm or more and 5 μm or less. When the particle size of the second inorganic particles is within this range, the first inorganic particles can be sufficiently covered in the powder cosmetic after crushing, desired optical characteristics can be easily obtained, and sufficient hiding power and coloring can be imparted. be able to. On the other hand, if the particle size is smaller than 0.1 μm, hiding power and coloring may not be sufficiently imparted. If the particle size is larger than 5 μm, the first inorganic particles cannot be sufficiently covered, and it may be difficult to control the scattering characteristics and the reflection characteristics. More preferably, it is 0.1 μm or more and 3 μm or less.

<Characteristic adjustment component (C)>
In addition to the first inorganic particles and the second inorganic particles, the cosmetic of the present invention may contain various components as the characteristic adjusting component (C). Examples thereof include a powder that imparts a light diffusion effect, a powder that imparts transparency and refractive index control, and a powder that imparts a light scattering effect. Examples of the powder that imparts the light diffusion effect include spherical powders having a refractive index of 1.3 or more and less than 1.5 such as silica, polystyrene, nylon, and PMMA (polymethylmethacrylate resin). Among them, spherical silica is preferable from the viewpoint of excellent dispersibility. Examples of the powder that imparts transparency and refractive index control include plate-shaped powders having a refractive index of 1.5 or more and less than 2.2, such as barium sulfate, alumina, cerium oxide, and boron nitride. Of these, tabular barium sulfate is preferable from the viewpoint of excellent extensibility to the skin. Examples of the powder that imparts the light scattering effect include a glittering powder such as titanium oxide-coated mica. The glittering powder can also impart a glossy feeling.

  In addition, a film-forming material, a surface treatment agent, a surfactant, an antioxidant, an antiseptic, a fragrance, a cosmetic ingredient, etc. can be appropriately added within a range that does not impair the effects of the present invention.

<Binder and liquid component (D)>
In the cosmetic of the present invention, in addition to the first inorganic particles, the second inorganic particles and the property adjusting component (C), an oil agent/aqueous component may be appropriately blended for the purpose of improving the adhesion to the skin and the feeling of use. ..

  The oil agent is an oily ingredient usually blended in cosmetics, and can be added regardless of classification of animal oil, vegetable oil, and synthetic oil. Examples thereof include waxes such as squalane, paraffin and candelilla wax, fatty acids such as oleic acid, olefin oligomers and silicone oils.

  Examples of the aqueous component include water, alcohols such as ethanol and isopropyl alcohol, glycols, glycerols, and the like, and one or more of these can be used.

<Composition>
In the cosmetic of the present invention, the content of the inorganic particle group consisting of the first inorganic particles (A) and the second inorganic particles (B) is 65% by mass or more. When the component of the inorganic particle group in the cosmetic is 65% by mass or more, the unevenness correction effect superior to the conventional technique can be obtained by satisfying the condition of the particle size distribution described later. On the other hand, when the amount is less than 65% by mass, it is necessary to apply a large thickness in order to sufficiently obtain the unevenness correction effect, and it becomes difficult to obtain a natural finish.

  The content of the second inorganic particles is preferably 10% by mass or more and 15% by mass or less with respect to the first inorganic particles. This is because when the content of the second inorganic particles is within the above range, it becomes easier to control the particle size within the range of the particle size distribution described later.

  The content of the characteristic adjusting component (C) is not particularly limited, but in order to make the content of the inorganic particle group 65% by mass or more of the total amount of the cosmetic, it may be 20% by mass or more and 30% by mass or less. preferable. The content of the binder/liquid component (D) is not particularly limited, but is preferably in the range of 2% by mass or more and 10% by mass or less from the viewpoint of easy packing after production.

<Particle size distribution>
The cosmetic of the first embodiment has the following features in the particle size distribution based on the number of inorganic particle groups.
(I) The particle size has a peak of maximum intensity in the range of 2 μm or more and 6 μm or less. (ii) The number of particles of less than 1 μm is 5% or more and 15% or less. , (Ii) at the same time, that is, by controlling the size of the first inorganic particles and the coverage of the second inorganic particles on the first inorganic particles, the proportion of specular reflection and diffuse reflection in the light incident on the skin. To control. As a result, the cosmetic material of the first embodiment exhibits an excellent unevenness correction effect.

  FIG. 2 is an explanatory diagram of the invention effect of the cosmetic material of the first embodiment. FIG. 2 shows a state in which the second inorganic particles 2 and the spherical silica 3 that is the characteristic adjusting component are arranged on the skin 10 so as to cover the extender pigment 1 that is the first inorganic particles.

  There is a difference in reflectance between the concave and convex portions of the skin. This is because there is a difference in light penetration depth between the concave portion and the convex portion. Therefore, if there are many regular reflection components 12 with respect to the light 11 that has entered the skin 10, the unevenness becomes conspicuous. The specular reflection component 12 tends to increase as the peak of the maximum intensity of the particle diameter of the inorganic particles (mainly the first inorganic particles) increases.

  If the difference in reflectance between the concave portion and the convex portion is small, the irregularities on the skin will not be noticeable. Therefore, if there are many diffuse reflection components 13 with respect to the light incident on the skin, the unevenness becomes less noticeable. The diffuse reflection component 13 tends to increase as the second inorganic particles having a particle size of less than 1 μm after pulverization are covered with the first inorganic particles.

  The peak of the maximum intensity of less than 2 μm means that the difference in particle diameter between the first inorganic particles and the second inorganic particles is small (FIG. 2(b)). Therefore, the specular reflection component 12 with respect to the light incident on the skin is small, and it is not possible to give the skin a texture such as brightness, transparency, and luster. On the other hand, when the maximum intensity peak exceeds 6 μm, it means that the first inorganic particles are too large and the second inorganic particles having a particle size of less than 1 μm after pulverization cannot sufficiently cover the first inorganic particles (FIG. 2( c)). Therefore, the specular reflection component by the first inorganic particles becomes strong with respect to the light incident on the skin, the bright spots by the convex portions are conspicuous, and the irregularities cannot be corrected.

  The fact that the number of particles of less than 1 μm is less than 5% by number means that the second inorganic particles excessively cover the first inorganic particles. Therefore, the specular reflection component with respect to the light incident on the skin is small, and it is impossible to give the skin a texture such as brightness, transparency, and luster. On the other hand, when the number of particles of less than 1 μm exceeds 15% by number, it means that the second inorganic particles of less than 1 μm do not sufficiently cover the first inorganic particles. Therefore, the diffuse reflection component for the light incident on the skin is small, and the unevenness of the skin cannot be sufficiently corrected.

<Reflectance>
The cosmetic of the first embodiment has 30%≦R0≦70%, where R0 is the reflectance at an incident angle of 0° and R50 is the reflectance at an incident angle of 50° of the coating film formed from the cosmetic. And satisfy 20%≦R50/R0≦50%. Here, R0 is an index indicating the specular reflection component for the light incident on the skin, and R50 is an index indicating the diffuse reflection component for the light incident on the skin. When R0 and R50 satisfy the above relationship, the ratio of specular reflection and diffuse reflection with respect to the light incident on the skin becomes a ratio at which an excellent unevenness correction effect is exhibited.

  On the other hand, if R0 is less than 30%, the specular reflection component is small, and thus it is not possible to impart a texture such as brightness, transparency, and luster to the skin. Further, if R50 exceeds 70%, the regular reflection component is too much, so that the unevenness becomes conspicuous.

  Further, if R50/R0 is less than 20%, there are few diffuse reflection components, so that the unevenness becomes conspicuous. On the other hand, when R50/R0 exceeds 50%, the diffuse reflection component is too much, and thus it is not possible to impart the texture such as brightness, transparency, and luster to the skin.

  The method for forming the coating film and the evaluation method will be described later.

<Manufacturing method>
The method for producing the cosmetic of the present invention will be described below.

  First, shearing force is applied to pulverize the extender pigment (A), which is the first inorganic particle. The means for applying the shearing force is not particularly limited, and in addition to mechanical shearing force, there are strong velocity field and velocity fluctuation, collision with inclusions or obstacles by media such as balls and beads, ultrasonic waves and the like. Examples of the apparatus include a homogenizer, a bead mill, a ball mill, an attritor, an ultrasonic homogenizer, a grinder, and a stirring mixer such as a Henschel mixer.

  Next, at least the first inorganic particles and the color pigment (B) that is the second inorganic particles are mixed to obtain a mixture in which the inorganic particle group including the first inorganic particles and the second inorganic particles is contained in an amount of 65% by mass or more. .. At this time, the characteristic adjusting component (C) and the binder/liquid component (D) may be mixed at the same time, or may be mixed in order. The method of mixing is not particularly limited, and may be a dry method or a wet method. Further, it may be performed at room temperature or while heating.

  The order of the step of pulverizing the first inorganic particles and the step of obtaining the mixture may be interchanged. The first inorganic particles may be crushed by crushing the mixture.

  The particle size of the first inorganic particles is controlled by applying a shearing force to crush the first inorganic particles. Therefore, when the first inorganic particles are crushed by applying a shearing force, the particle size becomes smaller than that before crushing. That is, it is possible to control the size of the particle size showing the maximum strength in the particle size distribution of the first inorganic particles and the second inorganic particles.

  Further, when the pulverization of the first inorganic particles progresses, the fracture surface of the first inorganic particles becomes in a highly active state. Therefore, the second inorganic particles are likely to be adsorbed on the surface of the first inorganic particles, and as a result, the first inorganic particles are likely to be covered with the second inorganic particles. That is, it is possible to control the coverage of the first inorganic particles with the second inorganic particles that are pulverized to be less than 1 μm, and the number% of particles of less than 1 μm in the post-particle distribution.

  As a result, the ratio of diffuse reflection (light scattering) and regular reflection of the cosmetic can be controlled, and a high unevenness correction effect can be realized.

  On the other hand, even if the first inorganic particles are pulverized without applying a shearing force, the second inorganic particles cannot be sufficiently covered with the first inorganic particles. Therefore, the ratio of diffuse reflection is small and a sufficient effect of unevenness correction cannot be obtained. If the shearing force on the first inorganic particles is too strong, or if the crushing process is made too long, there is a possibility that aggregation will proceed between the crushed first inorganic particles. When agglomeration occurs, the feeling of adhesion of the cosmetic to the skin and the feeling of elongation and the like may deteriorate. Therefore, it is preferable that the particle size of the first inorganic particles is not too small.

<Form of cosmetics>
The cosmetic of the present invention is preferably a powdery cosmetic when applied to the skin. Specifically, it can be suitably used for makeup cosmetics such as powder foundation, face powder, and white powder. The form such as a molded state or a powder state is not particularly limited.

[Second Embodiment]
The cosmetic of the second embodiment is a cosmetic having a color unevenness correction effect.

  Constituent components such as inorganic particles are the same as those in the first embodiment, but the particle size distribution and the correction effect are different. Hereinafter, the points different from the first embodiment will be described.

<Particle size distribution>
The cosmetic material of the second embodiment has the following characteristics in the number-based particle size distribution of the inorganic particle group including the first inorganic particles and the second inorganic particles.
(Iii) 6 particles% or more and 20 particles% or less of particles having a maximum intensity peak in the range of 3 μm or more and 8 μm or less (iv) less than 1 μm.
The cosmetic of the second embodiment simultaneously satisfies these (iii) and (iv), that is, by controlling the size of the first inorganic particles and the coverage of the second inorganic particles on the first inorganic particles, The ratio of transmitted light and diffuse reflected light in the light incident on is controlled. As a result, the powder cosmetic of the second embodiment exhibits an excellent color unevenness correction effect.

  If there are spots on the skin, there is a difference in reflectance between the spots and other portions. This is because the spot portion absorbs light and has less reflected components than the spot-free portion. Therefore, if the difference in reflectance with respect to the light incident on the skin is large, color unevenness becomes noticeable.

  Further, if the difference in reflectance between the spot portion and the other portion is small, the color unevenness becomes inconspicuous. In the conventional technique, the peak of the maximum intensity of the particle size of the inorganic particles was increased to increase the reflectance, so that the color unevenness coverage rate was about 60% by that method. However, as a result of earnest studies by the present inventors, it was found that increasing the diffuse reflection component is effective for further increasing the color unevenness coverage ratio. The diffuse reflection component tends to increase as the second inorganic particles having a particle size of less than 1 μm after pulverization are covered with the first inorganic particles.

  The peak of maximum intensity of less than 3 μm means that the difference in particle diameter between the first inorganic particles and the second inorganic particles is small. Therefore, there are many portions having low transmittance for the light incident on the skin, and it is not possible to provide the skin with textures such as brightness, transparency and luster. On the other hand, when the maximum intensity peak exceeds 8 μm, it means that the first inorganic particles are too large and the second inorganic particles having a particle size of less than 1 μm after pulverization cannot sufficiently cover the first inorganic particles. Therefore, the diffuse reflection of the first inorganic particles with respect to the light incident on the skin is small, the color of the spots is conspicuous, and the color unevenness cannot be corrected.

  The fact that the number of particles of less than 1 μm is less than 6% by number means that the second inorganic particles excessively cover the first inorganic particles. Therefore, there are many portions having low transmittance for the light incident on the skin, and it is not possible to provide the skin with textures such as brightness, transparency and luster. On the other hand, when the number of particles of less than 1 μm exceeds 15% by number, it means that the second inorganic particles of less than 1 μm do not sufficiently cover the first inorganic particles. Therefore, the diffuse reflection component with respect to the light incident on the skin is small, and the color unevenness cannot be sufficiently corrected.

Here, in the particle size distributions of the first and second embodiments, the following portions overlap.
(V) The number of particles having a maximum intensity peak in the range of 3 μm or more and 6 μm or less and (vi) less than 1 μm is 6% or more and 15% or less.

  In the range where both (v) and (vi) are satisfied at the same time, it is possible to achieve both the excellent unevenness correction effect and the color unevenness correction effect.

<Transmittance and reflectance>
The cosmetic of the second embodiment is 30%≦T0≦60%, where T0 is the transmittance at an incident angle of 0° and R20 is the reflectance at an incident angle of 20° of the coating film formed by the cosmetic. And satisfy 21%≦R20≦30%. Here, T0 is an index indicating a transmission component with respect to light incident on the skin, and R20 is an index indicating a diffuse reflection component with respect to light incident on the skin. When T0 and R20 satisfy the above relationship, the ratio of transmitted light and diffuse reflection with respect to the light incident on the skin becomes a ratio at which an excellent color unevenness correction effect is exhibited.

  On the other hand, when T0 is less than 30%, the transmitted light component is small, and thus it is not possible to impart a texture such as brightness, transparency, and luster to the skin. Further, if T0 exceeds 60%, spots on the skin are noticeable and color unevenness is noticeable.

  Further, when R20 is less than 21%, the diffuse reflection component is small, so that color unevenness becomes noticeable. On the other hand, when R30% is exceeded, the amount of diffuse reflection components is too large, and thus it is not possible to impart a texture such as brightness, transparency, and luster to the skin.

<Evaluation method>
(Measurement of particle size distribution)
The number-based particle size distribution was measured by the particle image imaging method. The apparatus used was Morphology G3 (Malvern Panalytical). 5 mm ³ of the cosmetic material was introduced into the sample dispersion unit and dispersed on the observation glass at a gas pressure of 5 bar. A particle image of 20,000 points was acquired at an observation magnification of 20 times, and the average equivalent circle diameter was calculated from the area, which was defined as the particle diameter.

(Roughness correction effect)
The unevenness correction effect was evaluated from the unevenness correction value calculated by frequency analysis from a pseudo-skin image taken by a microscope.

The cosmetic was applied onto the pseudo-skin (Bioskin, Bureaux Co., Ltd.) with a makeup brush to a concentration of 0.15 mg/cm ² . The pseudo skin after application was photographed by a photographing device (DS-2M-L2, Nikon Co.) to obtain an image of 1600×1200 dpi. A central area of 1100×700 dpi was extracted from the acquired image, and frequency intensities of RGB were calculated. With respect to the calculation result of the frequency intensity, in the spatial frequency region of 0.0 to 0.05 corresponding to the irregular shape assuming a pore (diameter 1 mm, depth 150 μm), the sum of the difference with the frequency intensity before and after application Was calculated and the average value was used as the unevenness correction value. The larger the positive value of the unevenness correction value, the less likely the unevenness is to stand out.

(Reflectance)
As a measurement sample, a transparent 15 mm square double-sided tape (KRS-15, 3M Co., Ltd.) was attached to the frosted surface of the entire surface frost slide glass (S5115, Matsunami Glass Co., Ltd.), and a cosmetic brush was used to evenly apply the cosmetics. It was made by applying to. The coating amount was weighed using a microbalance, and five measurement samples having different coating amounts were prepared. The coating ^{amount, 0.07mg / cm 2, 0.11mg /} cm 2, 0.14mg / cm 2, was 0.15 mg / cm ² and 0.18 mg / cm ^2. The prepared sample was placed in an ultraviolet-visible near-infrared spectrophotometer (V-770, JASCO Corporation), and the reflectance was measured.

The reflectance was measured in the range of 350 nm to 850 nm with an incident angle of 0°, 20°, and 50° and a detection angle of 0°, and the average reflectance was calculated. The reflectance average value with respect to the coating amount was linearly approximated to evaluate the reflectance with respect to 0.15 mg/cm ² .

(Color unevenness correction effect)
The color unevenness correction effect was evaluated by the color unevenness coverage rate.

The measurement sample was prepared by sticking a double-sided tape (KRS-15, 3M Co., Ltd.) cut on a slide glass to a certain area, and applying a cosmetic evenly on it with a makeup brush. The coating amount was weighed using a microbalance, and five measurement samples having different coating amounts were prepared. The coating ^{amount, 0.07mg / cm 2, 0.11mg /} cm 2, 0.14mg / cm 2, was 0.15 mg / cm ² and 0.18 mg / cm ^2. The prepared sample was installed in a spectrophotometer (SE7700, Nippon Denshoku Industries Co., Ltd.), and the spectral transmittance and the spectral reflectance were measured in the wavelength range of 380 nm to 730 nm.

The prepared sample and a pseudo-skin (Bioskin, Burelux Co., Ltd.) stain plate were set and measured, L*, a*, and b* were obtained from the measurement results, and the color difference was calculated from them. Four kinds of spots (P1) having different colors and a spotless part (P2) were measured, and a color difference ΔE1 when the cosmetic was applied and a color difference ΔE0 when the cosmetic was not applied were calculated. ΔE1 and ΔE0 can be obtained from Expression (1) and Expression (2).
ΔE1={(L ₁ *[P1]−L ₁ *[P2]) ² +(a ₁ *[P1]−a ₁ *[P2]) ² +(b ₁ *[P1]−b ₁ *[P2 ]) ² } (1)
ΔE0={(L ₀ *[P1]−L ₀ *[P2]) ² +(a ₀ *[P1]−a ₀ *[P2]) ² +(b ₀ *[P1]−b ₀ *[P2 ]) ² } (2)

  The color unevenness cover ratio F of the formula (3) was calculated from the obtained ΔE1 and ΔE0, and the average value of the color unevenness cover ratios for the four kinds of stains and the base portion was taken as the color unevenness cover ratio when the cosmetic application amount was constant.

(Transmittance)
As a measurement sample, a transparent 15 mm square double-sided tape (KRS-15, 3M Co., Ltd.) was attached to the frosted surface of the entire surface frost slide glass (S5115, Matsunami Glass Co., Ltd.), and a cosmetic brush was used to evenly apply the cosmetics. It was made by applying to. The coating amount was weighed using a microbalance, and five measurement samples having different coating amounts were prepared. The coating ^{amount, 0.07mg / cm 2, 0.11mg /} cm 2, 0.14mg / cm 2, was 0.15 mg / cm ² and 0.18 mg / cm ^2. The prepared sample was placed in an ultraviolet-visible near-infrared spectrophotometer (V-770, JASCO Corporation), and the transmittance was measured.

The transmittance was measured in the range of 350 nm to 850 nm at an incident angle of 0° and a detection angle of 0°, and the average transmittance was calculated. The average value of the transmittance with respect to the coating amount was linearly approximated to evaluate the transmittance with respect to 0.15 mg/cm ² .

As for the 20° incident reflectance, an average value was calculated by measuring the reflectance of 350 nm to 850 nm at an incident angle of 20° and a detection angle of 0°. The average value of the reflectance with respect to the coating amount was linearly approximated, and the reflectance was adopted for the coating amount of 0.15 mg/cm ² .

  The method for producing and evaluating the cosmetic material of the present invention will be specifically described below.

[Cosmetics with unevenness correction effect]
<Manufacture of cosmetics>
(Example 1)
First, raw material powders were prepared so that the ratios shown in Table 1 were obtained.

  Specifically, silicone-treated talc (A-1) and silicone-treated mica (A-2) were prepared as the first inorganic particles (A). As the second inorganic particles (B), titanium oxide (B-2), yellow iron oxide (B-3), red iron oxide (B-4), black iron oxide (B-5) and ultramarine blue (B-6) are prepared. did. Titanium oxide-coated mica (C-1), tabular barium sulfate (C-3), spherical silica (C-4), methyl paraoxybenzoate (C-5) and zinc myristate (C) as characteristic adjusting component (C) -6) was prepared. As the binder/liquid component (D), olephene oligomer (D-1), methylpolysiloxane (D-2) and squalane (D-3) were prepared.

  Next, the first inorganic particles (A) were mixed twice for 10 minutes with a planetary rotary mixer (Mazelstar KK-250S, Kurabo Co.).

  Subsequently, the mixture of the first inorganic particles was pulverized by a ball mill (planetary ball mill P-6, manufactured by FRITSH). The conditions of the ball mill were that the volume of the ball pot was 250 mL, the diameter of the zirconia balls was 3 mm, the ball volume filling rate in the ball pot was 24%, the rotation speed was 300 rpm, and the time was 1 hour.

  Then, the second inorganic particles (B) and the property adjusting component (C) were added, and the same planetary rotary mixer was used to perform mixing treatment for 5 minutes twice.

  The binder/liquid component (D) was further added, and the same planetary rotary mixer was used to perform a mixing treatment once for 5 minutes to obtain the cosmetic of Example 1.

  The raw materials listed in Table 1 are as follows.

(A) First inorganic particles A-1: Silicone-treated talc (Miyoshi Kasei Co., SA-talc-JA68R, particle diameter 11.2 μm)
A-2: Silicone-treated mica (Miyoshi Kasei Co., SA-Mica-M102, particle size 11.2 μm)
(B) Second inorganic particles B-1: zinc oxide (Miyoshi Kasei Co., Ltd., SAMT-UFZO-450, particle diameter 2.8 μm)
B-2: Titanium oxide (Miyoshi Kasei Co., SA-titanium MP-1133, particle diameter 1.2 μm)
B-3: Yellow iron oxide (Miyoshi Kasei Co., SA-Yellow LL-100P, particle size 1.7 μm)
B-4: Red iron oxide (Miyoshi Kasei Co., SA-Red-R516PS, particle diameter 1.4 μm)
B-5: Black iron oxide (Miyoshi Kasei Co., SA-Black-BL-100P, particle size 1.9 μm)
B-6: Ultramarine (Miyoshi Kasei Co., SA-Ultramarine-CB-B0 (100%), particle diameter 2.6 μm)
(C) Characteristic adjusting component C-1: Mica coated with titanium oxide (Merck & Co., Extender W, particle size 8.5 μm)
C-2: Titanium oxide coated mica (Merck & Co., Chimilon Super Sheen MP-1001, particle size 8.1 μm)
C-3: Plate-shaped barium sulfate (Sakai Chemical Co., Ltd., plate-shaped barium sulfate H, particle size 6.5 μm)
C-4: Spherical silica (Miyoshi Kasei Co., Ltd., SB-300, particle size 6.5 μm)
C-5: Methyl paraoxybenzoate (Client Japan Co., NIPAGIN M)
C-6: Zinc myristate (NOF Corp., powder base M)
(D) Binder/liquid component D-1: Olephene oligomer (NOMSCORT HPD-C, Nisshin Oil Co., Ltd.)
D-2: Methyl polysiloxane (Shin-Etsu Chemical Co., Ltd., Silicon KF96 (100CS))
D-3: Squalane (Kanto Chemical)

(Example 2)
In the crushing treatment with the ball mill, the cosmetic material of Example 2 was obtained by the same manufacturing method as in Example 1 except that the time was changed to 1 hour and 45 minutes.

(Example 3)
Except that the first inorganic particles (A) and the characteristic adjusting component (C) were mixed in the same planetary rotary mixer and then pulverized by a ball mill, and the second inorganic particles were added after the pulverization. The cosmetic of Example 3 was obtained by the same production method as in Example 1.

(Example 4)
With the same composition as in Example 1, the first inorganic particles (A), the second inorganic particles (B), the characteristic adjusting component (C) and the binder/liquid component (D) were added in that order, and an Ishikawa type stirring and crushing machine (Ishikawa A crushing treatment was carried out for 90 minutes with a factory-made, AGA type) to obtain the cosmetic of Example 4.

(Comparative Example 1)
With the same composition as in Example 1, the first inorganic particles (A), the second inorganic particles (B), the characteristic adjusting component (C) and the binder/liquid component (D) were added in order and mixed by a planetary rotary mixer. A cosmetic of Comparative Example 1 was obtained. That is, the cosmetic material of Comparative Example 1 was not subjected to the crushing treatment to which a shearing force was applied.

(Comparative example 2)
With the composition of Comparative Example 2 shown in Table 1, the first inorganic particles (A), the second inorganic particles (B), the characteristic adjusting component (C) and the binder/liquid component (D) were added in that order, and a planetary rotary mixer was used. To obtain a cosmetic of Comparative Example 2. That is, the cosmetic material of Comparative Example 2 was not subjected to the pulverization treatment to which a shearing force was applied.

(Comparative example 3)
With the composition of Comparative Example 3 shown in Table 1, the first inorganic particles (A), the second inorganic particles (B), the characteristic adjusting component (C) and the binder/liquid component (D) were added in that order, and a planetary rotary mixer was used. To obtain a cosmetic of Comparative Example 3. That is, the cosmetic material of Comparative Example 3 was not subjected to the crushing treatment to which a shearing force was applied.

(Comparative example 4)
With the composition of Comparative Example 4 shown in Table 1, the first inorganic particles (A), the second inorganic particles (B), the characteristic adjusting component (C) and the binder/liquid component (D) were added in that order, and a planetary rotary mixer was used. To obtain a cosmetic of Comparative Example 4. That is, the cosmetic material of Comparative Example 4 was not subjected to the crushing treatment to which a shearing force was applied.

<Evaluation of cosmetics>
With respect to the cosmetics of Examples 1 to 4 and Comparative Examples 1 to 4, the particle size distribution, reflectance and unevenness correction effect were evaluated. The evaluation results are shown in Table 2.

  According to Table 2, in the particle size distribution based on the number of inorganic particles, the cosmetics in which the peak having the maximum intensity is in the range of 2 μm to 6 μm and the number of particles of less than 1 μm is 5% to 15% is On the other hand, it can be seen that it has a high unevenness correction effect that is at least twice as high.

  Further, FIG. 1A is a graph in which the horizontal axis represents the peak particle diameter showing the maximum strength and the vertical axis represents the number% of particles less than 1 μm in the cosmetics of Examples 1 to 4 and Comparative Examples 1 to 4. Is. The inside of the dotted line indicates the range of 5% by number or more and 15% by number or less of particles having a peak particle size showing maximum intensity of 2 μm or more and 6 μm or less and less than 1 μm.

  From this, the powder cosmetics of Examples 1 to 4 can make finer irregularities of the skin such as pores, wrinkles, and roughness of the texture less noticeable than the powder cosmetics of Comparative Examples 1 to 4. Do you get it.

[Cosmetics with color unevenness correction effect]
(Example 5)
First, raw material powders were prepared so that the ratios shown in Table 3 were obtained.

  Specifically, silicone-treated talc (A-1) and silicone-treated mica (A-2) were prepared as the first inorganic particles (A). As the second inorganic particles (B), titanium oxide (B-2), yellow iron oxide (B-3), red iron oxide (B-4), black iron oxide (B-5) and ultramarine blue (B-6) are prepared. did. Titanium oxide-coated mica (C-1), tabular barium sulfate (C-3), spherical silica (C-4), methyl paraoxybenzoate (C-5) and zinc myristate (C) as the characteristic adjusting component (C) -6) was prepared. As the binder/liquid component (D), olephene oligomer (D-1), methylpolysiloxane (D-2) and squalane (D-3) were prepared.

  Next, the first inorganic particles (A) were mixed twice for 10 minutes with a planetary rotary mixer (Mazelstar KK-250S, Kurabo Co.).

  Subsequently, the mixture of the first inorganic particles was pulverized by a ball mill (planetary ball mill P-6, manufactured by FRITSH). The conditions of the ball mill were that the volume of the ball pot was 250 mL, the diameter of the zirconia balls was 3 mm, the ball volume filling rate in the ball pot was 24%, the rotation speed was 300 rpm, and the time was 15 minutes.

  Then, the second inorganic particles (B) and the property adjusting component (C) were added, and the same planetary rotary mixer was used to perform mixing treatment for 5 minutes twice.

  Further, the binder/liquid component (D) was added, and the same planetary rotary mixer was used to perform a mixing treatment once for 5 minutes to obtain a cosmetic of Example 5.

  The raw materials shown in Table 3 are the same as those shown in Table 1.

(Example 6)
In the pulverization treatment with the ball mill, the cosmetic of Example 6 was obtained by the same production method as in Example 5 except that the time was changed to 1 hour.

(Example 7)
In the pulverization treatment with the ball mill, the cosmetic of Example 7 was obtained by the same production method as in Example 5, except that the time was changed to 1 hour and 45 minutes.

(Example 8)
Except that the first inorganic particles (A) and the characteristic adjusting component (C) were mixed in the same planetary rotary mixer and then pulverized by a ball mill, and the second inorganic particles were added after the pulverization. The cosmetic of Example 8 was obtained by the same production method as in Example 5.

(Comparative Example 5)
With the same composition as in Example 5, the first inorganic particles (A) and the characteristic adjusting component (C) were added, and a mixing treatment was carried out twice for 10 minutes using a planetary rotary mixer. Then, the second inorganic particles (B) and the binder/liquid component (D) were added in order and mixed for 10 minutes twice with a planetary rotary mixer to obtain a cosmetic of Comparative Example 5. That is, the cosmetic material of Comparative Example 5 was not subjected to the crushing treatment by applying the shearing force.

(Comparative example 6)
With the composition of Comparative Example 6 shown in Table 3, the first inorganic particles (A), the second inorganic particles (B), the characteristic adjusting component (C) and the binder/liquid component (D) were added in that order, and a planetary rotary mixer was used. Was mixed twice for 10 minutes to obtain a cosmetic of Comparative Example 6. That is, the cosmetic material of Comparative Example 6 was not subjected to the pulverization treatment to which a shearing force was applied.

(Comparative Example 7)
With the composition of Comparative Example 7 shown in Table 3, the first inorganic particles (A), the second inorganic particles (B), the characteristic adjusting component (C) and the binder/liquid component (D) were added in that order, and a planetary rotary mixer was used. Was mixed twice for 10 minutes to obtain a cosmetic of Comparative Example 7. That is, the cosmetic material of Comparative Example 7 was not subjected to the pulverization treatment to which a shearing force was applied.

<Evaluation of cosmetics>
The cosmetics of Examples 5-8 and Comparative Examples 5-7 were evaluated for particle size distribution, transmittance, reflectance and color unevenness coverage. The evaluation results are shown in Table 4.

  According to Table 4, in the particle size distribution based on the number of inorganic particles, a cosmetic having a peak having a maximum intensity in the range of 3 μm or more and 8 μm or less and 6 particles% or more and 20 number% or less of particles less than 1 μm is On the other hand, it can be seen that there is an uneven color unevenness correction effect.

  Moreover, in FIG. 1(b), in the powder cosmetics of Examples 5 to 8 and Comparative Examples 5 to 7, the horizontal axis represents the peak particle size showing the maximum strength, and the vertical axis represents the number% of particles less than 1 μm. It is a graph. The dotted line indicates the range of 6% to 20% by number of particles having a peak particle size showing maximum intensity of 3 μm or more and 8 μm or less and less than 1 μm.

  From this, it has been found that the powder cosmetics of Examples 5 to 8 can make the minute shades of skin such as spots and freckles less noticeable than the powder cosmetics of Comparative Examples 5 to 7.

1 1st inorganic particle 2 2nd inorganic particle

Claims (15)

A cosmetic containing 65% by mass or more of an inorganic particle group consisting of first inorganic particles and second inorganic particles,
The first inorganic particles are at least one selected from mica, talc, sericite, smetite, synthetic mica,
The second inorganic particles are at least one selected from zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide and ultramarine blue,
In the number-based particle size distribution of the inorganic particle group, the peak of maximum intensity is in the range of 2 μm or more and 6 μm or less, and the number of particles of less than 1 μm is 5% or more and 15% or less by number. Cosmetics. A cosmetic containing 65% by mass or more of an inorganic particle group consisting of first inorganic particles and second inorganic particles,
The first inorganic particles are at least one selected from mica, talc, sericite, smetite, synthetic mica,
The second inorganic particles are at least one selected from zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide and ultramarine blue,
When the reflectance at an incident angle of 0° of the coating film formed of the cosmetic is R0 and the reflectance at an incident angle of 50° is R50,
A cosmetic characterized by satisfying 30%≦R0≦70% and 20%≦R50/R0≦50%.   The cosmetic according to claim 2, wherein, in the number-based particle size distribution of the inorganic particle group, the particle size has a maximum intensity peak in a range of 2 μm or more and 6 μm or less, and 5% by number of particles less than 1 μm. The above cosmetics are 15% by number or less. A cosmetic containing 65% by mass or more of an inorganic particle group consisting of first inorganic particles and second inorganic particles,
The first inorganic particles are at least one selected from mica, talc, sericite, smetite, synthetic mica,
The second inorganic particles are at least one selected from zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide and ultramarine blue,
In the number-based particle size distribution of the inorganic particle group, the peak of the maximum intensity is in the range of 3 μm or more and 8 μm or less, and the number of particles of less than 1 μm is 6 number% or more and 20 number% or less. Cosmetics. A cosmetic containing 65% by mass or more of an inorganic particle group consisting of first inorganic particles and second inorganic particles,
The first inorganic particles are at least one selected from mica, talc, sericite, smetite, synthetic mica,
The second inorganic particles are at least one selected from zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide and ultramarine blue,
When the transmittance at an incident angle of 0° of the coating film formed of the cosmetic is T0 and the reflectance at an incident angle of 20° is R20,
A cosmetic characterized by satisfying 30%≦T0≦60% and 21%≦R20≦30%.   The cosmetic according to claim 5, wherein in the number-based particle size distribution of the inorganic particle group, the particle size has a maximum intensity peak in the range of 3 μm to 8 μm and 6% by number of particles less than 1 μm. 20% by weight or less and cosmetics.   The number-based particle size distribution of the inorganic particle group has a peak of maximum intensity in a particle size range of 3 μm or more and 6 μm or less, and particles of less than 1 μm are 6 number% or more and 15 number% or less. The cosmetic according to any one of 1.   The cosmetic according to any one of claims 1 to 7, wherein a content of the second inorganic particles is 10% by mass or more and 15% by mass or less with respect to the first inorganic particles.   The cosmetic according to any one of claims 1 to 8, further comprising spherical silica.   The cosmetic according to any one of claims 1 to 9, further comprising tabular barium sulfate.   The cosmetic according to any one of claims 1 to 10, wherein the cosmetic further comprises titanium oxide-coated mica. A step of applying a shearing force to the first inorganic particles selected from at least one selected from mica, talc, sericite, smetite, and synthetic mica, and crushing;
The first inorganic particles are mixed with at least the first inorganic particles and second inorganic particles selected from at least one of zinc oxide, titanium oxide, yellow iron oxide, red iron oxide, black iron oxide, chromium oxide and ultramarine blue. And a step of obtaining a mixture containing 65% by mass or more of an inorganic particle group consisting of the second inorganic particles,
Of manufacturing cosmetics having The average particle size of the first inorganic particles before the step of pulverizing and the step of obtaining the mixture is 8 μm or more and 20 μm or less,
In the number-based particle size distribution of the inorganic particle group after the step of pulverizing and the step of obtaining the mixture, the particle size has a peak of maximum intensity in the range of 2 μm or more and 6 μm or less, and 5 particles less than 1 μm % Or more and 15 number% or less, The manufacturing method of the cosmetics of Claim 12. The average particle size of the first inorganic particles before the step of pulverizing and the step of obtaining the mixture is 8 μm or more and 20 μm or less,
In the number-based particle size distribution of the inorganic particle group after the step of pulverizing and the step of obtaining the mixture, the particle size has a maximum intensity peak in the range of 3 μm to 8 μm, and 6 particles less than 1 μm % Or more and 20 number% or less, The manufacturing method of the cosmetics of Claim 12.   The method for producing a cosmetic according to claim 12, wherein a step of obtaining the mixture is performed after the step of pulverizing.

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